Warp stop mechanism for looms



Dec. 4, 1928. 1,693,776

H. A. DAvls VIARP STOP MECHANISM FOR LOOMS Filed Feb. 9, 1928 :s sheets-sheer 1 asf/Html.

u E m Dec. 4, 1928.

H. A. DAVIS wARP sToP MECHANISM FOR Loous Filed Feb. 9, 1928 3 5.29618-511661. 2

wvl/ENTQR ATTORNEY Dec. 4, 1928.

H. A. DAVIS wARP s'roP MECHANISM FOR Loous Filed Feb. 9, 1928 3 Sheets-Sheet nvm Mfm. A

ATTORN/Y l l I I l I I I r I l l Il l Patented Dec. 4, 1928.

y I 1,693,776 UNITED STATES PATENT OFFICE.

HARRY A. DAVIS, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR T DRAPER CORPORA- TION, 0F HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WARP STOP MECHANISM FOR LOOMS.

Application nled February This'invention relates to warp sto mechanism for looms whereby the loom is rought to rest on the occurrence of a warp fault.

Mechanical warp stop mechanisms as now generally understood are of two types, one in which the detector is iven an oscillating or sliding movement in t e general direction of the warp thread or towards and from the front of the loom, and the other, in which the zo detecting member is constituted as a toothed bar and is given movement transversely of the warp thread. The present invention is more particularly directed to the latter type of warp stop mechanism, and has for one of its objects to provide a simple and effective construction of warp stop mechanism wherein upon the occurrence of a warp fault the loom will not only be stopped but the location of the fault will be indicated to enable the loom attendant to piece up the broken or too slack thread. y

In that' type of warp stop mechanism wherein the detector is constituted as e a toothed bar movable transversely of the loom in its detecting movement, it is now the usial practice to associate with such detector a stationary toothed detecting bar running parallel to the detector, so that when a warp thread breaks or becomes too slack for weaving pur- 311 poses, the fallen drop wire will engage a tooth of the stationary toothed bar and also a tooth of the movable toothed'bar and eiect loom stoppage.

In accordance with the present invention, a toothed detecting j bar having movement transversely of theloom, is given its detecting movements from an actuator, and, eX- tending transversely of the toothed detector there is a series of stop bars which extend transversely above the detectorv in separated relation and divide the drop wires into groups, so that should a drop wire indicate a warp fault it will be engaged by thetransversely movable detector and will be moved thereby until arrested by one of the stop bars at either side of the grouped drop wires. Such movement of the drop wire or drop wires will separate the warp threads of the group controlled by the drop wires between two adjacent stop ars and consequently locate the warp fault and effect loom stoppage when the detector is arrested.

The invention and new combination of parts will best be made clear from the following description and the accompanying 9, 1928. Serial No. 253,025.

drawings of one good practical form thereof.

In the drawings:

Fig. 1 is a perspective View showing pori tions of a loom and a warp stop mechanism containing the present invention;

\ Fig. 2 is an enlarged sectional View on the line 2 2 of Fig. 1;

Fig. 3 is an enlarged detail View of a portion of the warp stop mechanism4 showing one of thedrop wires released by a warp thread and the drop wires of the group sep.- arated to indicate the warp fault and Fig. 4 is an enlarged detail showing the relation of parts when a drop wire at the end of a group is released b a warp thread.

The loom frame 1 may e of usual construction and rising from each side thereof is the support 2 which is herein shown as an upwardly projecting rod for the support of the main portions of the warp stop mechanism at each sideof the loom. Mounted upon each of the supports 2 is a cap piece 3 having a` sleeve 4 through which passes the rod 5 to which may be secured a collar 6 having a downwardly extending flange 7 for the support of the detector or detectors, it being understood that there is such a support 7 at each side of the loom.' Extending between the two supports 7 is a toothed detectorS which may b e appropriately guided in its transverse movements by suitable supporting means, which, in the present instance of the invention, consists of the transversely extending bars 9 having side flanges 10 between which the toothed detector 8 may be reciprocated transversely of the loom.

One of the supports 7 has an arm 11 (Fig. 3) on which is mounted the rock shaft 12 carrying a series 'of rockers 13 on which are mounted the actuators 14, and pivotally connected to each actuator is a link 15 in which engages a pin 16 on the associated toothed detector, the result being that when the actuators are given their actuating movement, the detectors will be correspondingly reciprocated in a direction transversely ofthe loom.

Each of the actuators 14 is provided with two lugs 17 (Fig. 3) adapted to be seated in the recesses 18 formed in their associated rockers 13, and each actuator is yi'eldingly connected to its rocker by a spring 19. Each of the rockers 13 has connected thereto a finger 20 pivotally mounted at 21 on the associated rocker and connected to the actuator byY a pin 22, the construction being such that should one of the actuators' be restrained from movement with its rocker, its connected finger 20 will have its outer end portion depressed and act througha member 23 upon a pin 24 to effect loom stoppage.

The rock shaft 12 is given its rocking movement b suitable means, such as the arm 24x (Fig. 3 which has at the outer end a link 25 l0 actuated by some goin part ofthe loom as, for instance, a cam on t e lower or cam shaft, which may be of usual construction.` The construction thus far described is, or may be, substantially the same as that described 15 in the patent to Davis and Johnson, No. 1,538,625, dated May 19 1925, and further description thereof would appear unnecessar Itach of the transversely movable toothed 20 detectors has associated with it a series of drop wires 26 eachof which is rovided'with a slot 27 in its upper portion t lrough lwhich passes the transversely 'movable toothed detector. The dropwires may be of any'usual well-known type but as shown in the present instance of the invention each is provided with an eye or opening 28 (Fig. 2) through which the warp threads a extend and y which the drop' wires are normally sup- 30 ported during weaving.

The warp threads a pass from the usual warp beam 29 (Fig. 1) over the whip roll 30.

and over kthe warp 'supporting rods 31, of which there may be one at each side of the stop mechanism extending transversely of e loom, and, if desired, there may be a further supporting rod 32 located between the banks or series of drop wires, as indicated in Fig. 2. `The warp supports may be sustained'` by any usual or desired means but in the present instance of the invention, as indicated more clearly in Fig. 2, there is a slotted arm 33 through which passes a bolt 34 for securing the warp supports at each side of the loom. 46 Atits lower end the slotted arm has a base portion 35 provided with suitable 'bearings 36 which support the warp supportin rod 31. In' some instances it may be desira le to provide a central brid e for strengthening 50 the warp stop mechanism between the side frames, and this may be constituted by a late 37 having a slot 38 for engagement wit 1 the central .warp support 32, as' indicated in Fig.

` 2, and at its upper portion suitable recesses may be formed for the 'extension of the trans- /versely movable detector supports 9. These details, however, may be varied within wide limits in -accordance with the preferenceI of the user. As `shown in Fig. 2, the plate 37 eo may be appropriately supported from the warp supports 31 by arms 39. f

In order that the toothed detectors, of which there may be an number suitable to the number of'banks o drop Wires, may be retainedv in their seats in the side supports 7,

a cap piece 40 may be secured to each of the side supports 7 and extend above the end portions of the detector su ports 9.

As hereinbefore indicate -an important feature of the present invention consists in a series of sto barsV which extend transversely above t e movable detector orldei tectors and divide the drop wires into groups, so`that should one of the drop wires ot' a group 1t wil dro or fall into engagement with the transversely movable toothed detector and be moved by it until the top portion of a drop wire in that group engages a stop bar, whereupon, the loom is stopped with the warp fault indicated by a separation ofthe drop wires land warp threads slipported thereby, a condition indicated in ig. 1. While the stop bars for the performance of Y the function hereinbefore noted may be va- 35 riously contrived, the present instance of the v invention shows the stop bars carried b astop frame which is so connected witht e side supports of the stop motion that the stop frame .ma be moved upwardly to remove the sto bars rom between the drop wires.

he stop frame as'indicated 'n the resent' instance of the invention comprises t e side rods, 41 and 42, one of which is mounted in the bifurcated end portion 43 of the side sup 5 porting frame 7 and held therein by suitable means, such, for instance, as the cotter pin 44, so that the entire frame may be swung 4upwardl into the dotted line position, as indicate in Fig. 2. m0

Extending between the two side rods 41 and 420i the stop frameare the stop bars 45 which, when the stop frame is in operative position, extend transversely above the toothed detector or detectors 8 and between 105 the top portions of the drop wires, thereby dividing the dro wires into groups of suitable number. e Vstop bars 45` are strungl upon the rods 41 and 42 and are held in separated relation by the separators 46, each of which may be conveniently formed as a hollow sleeve, one of which is placed vbetween achdtwo stop bars, as indicated in Figs.

, Inl order that the stop frame may be ro 115 l erly held in its operative position wit t e stop bars extending above the toothed detectors, a yielding clip 47 may be appropriately.V

provided by mountin it pivotally upon a pin 48 (Fig. 2) carrie by an arm 49 secured" 130 to the cag 40, one at each side of the loom and as in icated in Fig. 3. The clip 47 may be formed as a spring member, so that it may be readily en aged with or disengaged from the co-operating rod 42. 2"

In some instances it may be desirable to provide a cli such as that already described on a central ridgeor plate 37, as indicated in Fig. 1, .whereby the stop frame may be effectively held in properposition with the 13 fail to be supported by a warp thread 75 i stop bars extending transversely above the toothed detectors and between the upper portions of the drop wires during normal position of the parts. When the clips 47 are swung outwardly, as indicated in Fig. 2 by dotted lines, the entire stop frame may be swung from its operative position into the dotted line position of Fig. 2, thereby permitting the toothed detectors and their guiding supports, if desired, to be removed from the loom with the drop wires strung thereon.

The stop bars 45 have their lower edge portions closely adjacent to the toothed detectors, as indicatedin Fig. 2, and each of the stop bars may be provided with slots 50.

During normal weaving-operation the drop wires 26 are supported by the warp threads and the actuators 14 impart to the toothed detectors their movements transversely of the loom. Should one of the warp threads break or become too slack for weaving purposes, the drop wire of the group which was supported by such thread will fall and be engaged by the'transversely moving detector until a drop wire of that group is moved into engagement with one of the stop bars which form the group, whereupon the toothed detector will be stopped, and, owing to the transverse movement imparted to the drop wire, the warp threads will be separated, as indicated in Figs. l and 3, to indicate the warp fault. This condition is particularly observable when the fallen drop wire is an intermediate one of its group, in which case it' will be moved with the toothed detector and with it all other drop wires between it and the stop bar which is being approached by the fallen drop wire, thereby making a wide opening in the warp to readily indicate thewarp fault and then eiect loom stoppage by arrest of t-he movement of the detector. Should one of the end drop wires of a group be unsupported by its warp thread, as indicated by Fig. 4, it will be engaged by thetooth of the detector 8 and its upper portion, as indicated at 5l, Fig. 4, will be arrested by engagement with the stop bar 45 forming that group, whereupon the fallen drop wire will have its lower portion swung laterally of thegroup, thereby forcing the other drop wires of the adjoining group laterally, to again indicate the warp fault and eliect loom stoppage by arrest of a detector. f

Vhen the stop frame is in its operative position, as indicated in Figs. 1 and 2, it mayconveniently be supported by the end portion of the bracket 49, as indicated in Fig. 3, but if desired other positioning means might be employed, the essential in this respect being that when the stop frame is inits operative position it will be securely held thereto during normal weaving operations to thereby position the stop bars in transverse relation to and above the detector or detectors.

What is claimed is:

wires into a plurality of groups transversely V of the loom, and means for effecting loom stoppage when any drop wire ofa group is moved by the,toothed detector into engagement with and is stopped in its transverse movement by a fixed stop bar on the occurrence of a warp fault. l

2. In a warp stop mechanism for looms, the

combination of a plurality or series of drop wires normally supported by the warp threads during weaving, a transversely movable toothed detector for each series of drop wires, a series of fixed stop bars extending transversely above the toothed detectors and. dividing the dropl wiresl of each series into similar groups, and means for effecting loom stoppage when a drop wire of any group is moved transversely into engagement with and is stopped in its transverse movement by a fixed stop bar and. thereby arrests movement of the detector.

3, In a warp stop mechanism for looms, the combination of a series of drop wires, a transversely movable' detector, a series of fixed stop bars extending transversely. above vthe detector and warp threads and dividing the drop wires into groups between the stop bars and provided with guiding recesses in their lower edge for the transversely movable detector, and means for effecting loom stoppage when a drop wire'is engaged by the toothed detector and arrests its movement by engagement with a. fixed stop bar on the occurrence of a warp fault.

4. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a transversely movable toothed detector, a stop frame' having a series ofstop bars extending transversely above the" detector between the drop wires and dividing the drop wires and dividing the drop wires into groups above the warp threads, and means for effecting loom stoppage when a drop wire of any group is moved transversely by the detector to indicate the warp fault and is eJtopped in its movement by one of the stop ars.

j5. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a transversely movable toothed detector, a stop frame having a series of fixed stop bars extending transversely above the detector between the .drop wires and dividing the drop wires into groups, spacers between and for separating the stop bars, and means for effecting loom stoppage when a drop'wire.Y

flo

of any group.` is moved transversely by the detector to indicate the warp fault and is .topped in its movement by one of the stop ars. l

6. In a warp stop mechanism for looms,

the combination of a series of drop wires normally supported bythe Warp threads during stop-bars from between the drop wires','and means for eccting loom stoppage when thethe detector is arrested by a len drop wire through engagement of one of the drop wires with a stop bar.

7. In a 'Warp stop mechanism for looms, the combination of a series of dro wires, a

toothed detector, an actuator for imparting movements to the detector transversely of the loom, a stop frame comprising side rodshone at each side of the drop wires, stop bars extending between the side lrods transversely above the detector and warp threads, means for supporting the stop frame that it and the stop bars may be turned upwardly from operative position, and means for effecting loom Stoppa e when a fallen drop .wire has been moved y the detectorto locate the warp fault and then arrested by one of the stop bars.

,8. In a warp stop mechanism for looms, the combination of a series of drop wires, a detector having teeth for engagement by a vfallen drop wire, an actuator for movin the detector transversely of the loom and e ecting movement of the fallen drop wire to locate the warp fault, a series of stop bars extending transversely between the top portions of the dropI wires above the detector and warp threads and a ainst one of,which a dropvwire is moved b t e detector and then arrested to stop the etector, and means for effecting loom stoppage when the detector is stop ed.

9. In a warp stop mechanism for ooms, the combination 0f aseries of drop wires, a detector having teeth for engagement by a fallen drop Wire, an actuator for movin the detector transversely of the loom and e ecting movement of the fallen drop wire to locate the Warp fault, a stop frame having a series of spaced stop bars extending transversely above thedetector between the top portions of 'the drop wires and mounted for upward swinging movement, and means for stopping the loom when the detector is arrested b thel engagement of one of the drop wires with a stop lbar as the drop wire is moved with the detector. l

t In testimony whereofI have signed my name to this specification.

HARRY A. DAVIS. 

